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    <h1 class="title">.NET CORE 下通过 SmtpClient 发送邮件</h1>
  


      
        <time datetime="2020-11-19T13:30:51.000Z">
          create: 2020-11-19 21:30:51 | update: 2020-11-19 21:30:51
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    <div class="entry">
      
      <p>通过本文你可以实现：使用 .NET SmtpClient 来发送邮件</p>
<ul>
<li>基础使用：仅含有邮件内容，无附件；</li>
<li>发送含有附件的邮件；</li>
<li>以及抄送等功能。</li>
</ul>
<a id="more"></a>
<h1 id="接口及实现："><a href="#接口及实现：" class="headerlink" title="接口及实现："></a>接口及实现：</h1><p></p><p class="code-caption" data-lang="csharp" data-line_number="backend" data-trim_indent="backend" data-label_position="outer" data-labels_left="Code" data-labels_right=":" data-labels_copy="Copy Code"><span class="code-caption-label"></span></p><p></p>
<pre><code class="csharp">public class MailNotificationConfiguration
{
    public string SMTP { get; set; }
    public string[] Notify { get; set; }
    public string[] EmailWhiteList { get; set; }
}

public interface INotificationService
{
    Task NotifyByMailAsync(string subject, string body, string[] to, object att = null, string[] cc = null);

    string MakeEmailBody(string name, params string[] contentLines);
}

public class NotificationService : INotificationService
{
    private readonly MailNotificationConfiguration _notificationConfig; 
    private readonly string _env;
    /// &lt;summary&gt;
    /// 
    /// &lt;/summary&gt;
    /// &lt;param name=&quot;config&quot;&gt;&lt;/param&gt;
    /// &lt;param name=&quot;environment&quot;&gt;value of environment variable:ASPNETCORE_ENVIRONMENT&lt;/param&gt;
    public NotificationService(MailNotificationConfiguration config, string env)
    {
        _notificationConfig = config;
        _env = env;
    }

    public string MakeEmailBody(string name, params string[] contentLines)
    {
        var contentSb = new StringBuilder(&quot;&lt;html&gt;&quot;);
        contentSb.Append(&quot;&lt;body&gt;&quot;);
        contentSb.Append($&quot;&lt;p&gt;Hi {name}, &lt;/p&gt;&quot;);
        contentSb.Append(&quot;&lt;div&gt;&quot;);
        if (contentLines != null &amp;&amp; contentLines.Count() &gt; 0)
        {
            foreach (var item in contentLines)
            {
                contentSb.AppendLine($&quot;&lt;p&gt;{item}&lt;/p&gt;&quot;);
            }
        }
        contentSb.Append(&quot;&lt;div&gt;&quot;);
        contentSb.Append(&quot;&lt;br/&gt;&quot;);
        contentSb.Append(&quot;&lt;div&gt;&quot;);
        contentSb.Append(&quot;&lt;p&gt;Thanks &amp; Regards&lt;/p&gt;&quot;);
        contentSb.Append(&quot;&lt;p&gt;XXXX&lt;/p&gt;&quot;);
        contentSb.Append(&quot;&lt;p&gt;&lt;b style=&#39;background-color:yellow&#39;&gt;Note: This mail is sent automatically, please do not reply.&lt;/b&gt;&lt;/p&gt;&quot;);
        contentSb.Append(&quot;&lt;/div&gt;&quot;);
        contentSb.Append(&quot;&lt;/body&gt;&quot;);
        contentSb.Append(&quot;&lt;/html&gt;&quot;);

        return contentSb.ToString();
    }

    public async Task NotifyByMailAsync(string subject, string body, string[] to, object att = null, string[] cc = null)
    {
        var mail = new MailMessage()
        {
            From = new MailAddress(&quot;SENDING_EMAIL_NAME@XXXX.com&quot;, &quot;EMAIL_DISPLAY_NAME&quot;),
            BodyEncoding = Encoding.UTF8,
            IsBodyHtml = true,
            DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure,
            Subject = IsProductEnvironment()
                        ? subject
                        : $&quot;[{_env}] {subject}&quot;,
            Body = body
        };

        var inMailAttachment = att as Attachment;

        if (inMailAttachment != null)
        {
            mail.Attachments.Add(inMailAttachment);
        }
        to.ToList().ForEach(n =&gt; mail.To.Add(n));

        cc?.ToList().ForEach(ccAddress =&gt; mail.CC.Add(ccAddress));

        try
        {
            using var client = new SmtpClient
            {
                Host = _notificationConfig.SMTP, //mail server host
                DeliveryMethod = SmtpDeliveryMethod.Network
            };

            if (IsProductEnvironment())
            {
                await client.SendMailAsync(mail);
            }
            else
            {
                //验证是否白名单用户，对 mail.To 属性进行过滤，仅发送给白名单用户
                /* mail.To = 白名单用户*/
                if (mail.To.Count() &gt; 0)
                    await client.SendMailAsync(mail);
            }
        }
        catch (Exception ex)
        {
            ;
        }
        finally
        {
            if (inMailAttachment != null)
                inMailAttachment.Dispose();
        }
    }

    private bool IsProductEnvironment()
    {
        return _env == &quot;Production&quot; || _env == &quot;Stage&quot;;
    }
}
</code></pre>
<h1 id="配置信息"><a href="#配置信息" class="headerlink" title="配置信息"></a>配置信息</h1><p>appsettings.json</p>
<p></p><p class="code-caption" data-lang="json" data-line_number="backend" data-trim_indent="backend" data-label_position="outer" data-labels_left="Code" data-labels_right=":" data-labels_copy="Copy Code"><span class="code-caption-label"></span></p><p></p>
<pre><code class="json">{
  &quot;MailNotification&quot;: {
    &quot;SMTP&quot;: &quot;email server host address&quot;,
    &quot;Notify&quot;: [ &quot;1@1.com&quot;, &quot;2@2.com&quot;],
    &quot;EmailWhiteList&quot;: [
      &quot;user1&quot;,
      &quot;user2&quot;,
    ]
  }
}
</code></pre>
<h1 id="使用示例："><a href="#使用示例：" class="headerlink" title="使用示例："></a>使用示例：</h1><h2 id="在-IOC-中进行注入"><a href="#在-IOC-中进行注入" class="headerlink" title="在 IOC 中进行注入"></a>在 IOC 中进行注入</h2><p></p><p class="code-caption" data-lang="csharp" data-line_number="backend" data-trim_indent="backend" data-label_position="outer" data-labels_left="Code" data-labels_right=":" data-labels_copy="Copy Code"><span class="code-caption-label"></span></p><p></p>
<pre><code class="csharp">public void ConfigureServices(IServiceCollection services)
{
   services.Configure&lt;MailNotificationConfiguration&gt;(Configuration.GetSection(&quot;MailNotification&quot;));
   services.AddSingleton&lt;INotificationService, NotificationService&gt;(sp =&gt; new NotificationService(sp.GetService&lt;IOptions&lt;MailNotificationConfiguration&gt;&gt;().Value, Environment.GetEnvironmentVariable(&quot;ASPNETCORE_ENVIRONMENT&quot;)));
}
</code></pre>
<h2 id="基础使用示例"><a href="#基础使用示例" class="headerlink" title="基础使用示例"></a>基础使用示例</h2><p></p><p class="code-caption" data-lang="csharp" data-line_number="backend" data-trim_indent="backend" data-label_position="outer" data-labels_left="Code" data-labels_right=":" data-labels_copy="Copy Code"><span class="code-caption-label"></span></p><p></p>
<pre><code class="csharp">public class SomeController : ControllerBase
{
    private readonly INotificationService _notificationService;
    public SomeController(INotificationService notificationService)
    {
        _notificationService = notificationService;
    }

    public async Task&lt;IActionResult&gt; SendEmail()
    {
         var toMails = new []{};
        var contents = new string[]
        {
             &quot;1&quot;,
             &quot;2&quot;,
             &quot;3&quot;
        };
        var body = _notificationService.MakeEmailBody(&quot;team&quot;, contents);
       await  _notificationService.NotifyByMailAsync(&quot;email title&quot;, body,  toMails);
        return Ok();
    }
}
</code></pre>
<h2 id="发送附件示例"><a href="#发送附件示例" class="headerlink" title="发送附件示例"></a>发送附件示例</h2><p></p><p class="code-caption" data-lang="csharp" data-line_number="backend" data-trim_indent="backend" data-label_position="outer" data-labels_left="Code" data-labels_right=":" data-labels_copy="Copy Code"><span class="code-caption-label"></span></p><p></p>
<pre><code class="csharp">public class SomeController : ControllerBase
{
    private readonly INotificationService _notificationService;
    public SomeController(INotificationService notificationService)
    {
        _notificationService = notificationService;
    }

    public async Task&lt;IActionResult&gt; SendEmail()
    {
        var toMails = new []{};
        var ccMails = new []{};
        var contents = new string[]
        {
             &quot;1&quot;,
             &quot;2&quot;,
             &quot;3&quot;
        };
        var file = GetFileByteArray(); //file content
       using (Stream stream = new MemoryStream(file))
       {
           var att = new Attachment(stream, $&quot;yourfile.xlsx&quot;);
           await _notificationService.NotifyByMailAsync($&quot;your email title&quot;,&quot;email body content&quot;,
              toMails,
               att,
              ccMails);
       }

        return Ok();
    }
}
</code></pre>

      

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